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Framework changes needed for HDR

Harish Krupo requested to merge harishkrupo/weston:hdr_framework into master

Initial changes required for adding HDR related patches. Part of !124

Rewritten Dec 4, 2020.

Depends on: !520 (merged) and !529 (merged)

This series prepares the GL-renderer for future color management and HDR work:

  • switch to übershader approach with the fragment shaders, improving readability
  • on-demand, requirements based fragment shader compiling and caching, because with CM&HDR work the number of possible shader variants is expected to explode
  • a temporary API for enabling experimental color features, and a capability bit for color operations
  • shader debug aides
  • intermediate shadow framebuffer support in GL-renderer, using half-float pixel format, allowing two-pass composition particularly for blending in linear pixel values in the future
  • weston.ini option to turn the shadow FB on per output (temporary until color management is implemented)
Edited by Pekka Paalanen

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